Mont Alto, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mont Alto, a borough in Franklin County, Pennsylvania.
Today
74°F
Mostly Sunny
Mostly sunny, with a high near 74. South wind 3 to 13 mph, with gusts as high as 21 mph.
7-day forecast for Mont Alto
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Mostly Sunny | 3 to 13 mph S | 1% |
| Tonight | 61°F | Light Rain | 12 mph S | 87% |
| Thursday | 74°F | Light Rain Likely | 5 to 12 mph S | 71% |
| Thursday Night | 56°F | Chance Light Rain | 1 to 5 mph W | 50% |
| Friday | 68°F | Slight Chance Light Rain | 3 mph NW | 19% |
| Friday Night | 47°F | Slight Chance Light Rain then Partly Cloudy | 5 mph NW | 15% |
| Saturday | 59°F | Mostly Sunny | 5 to 13 mph W | 12% |
| Saturday Night | 40°F | Partly Cloudy | 6 to 12 mph W | 12% |
| Sunday | 58°F | Mostly Sunny | 6 to 12 mph NW | 3% |
| Sunday Night | 38°F | Mostly Clear | 8 mph W | 3% |
| Monday | 59°F | Sunny | 7 to 14 mph W | 4% |
| Monday Night | 37°F | Mostly Clear | 5 to 8 mph W | 4% |
| Tuesday | 63°F | Sunny | 5 to 12 mph W | 3% |
| Tuesday Night | 38°F | Mostly Clear | 7 mph W | 0% |
Forecast source: National Weather Service (api.weather.gov) for Mont Alto (39.840, -77.556). Updated through the day.
Growing snapshot for Mont Alto
Last spring frost
Apr 27
First fall frost
Oct 20
Growing season
177 days
Hardiness zone
7a
More local growing data for Mont Alto: nearby ZIP 17237 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Blue Ridge Summit
Chambersburg
Fayetteville
Fort Loudon
Greencastle
Guilford
Marion
Mercersburg
Orrstown
Pen Mar
Rouzerville
Scotland
State Line
Wayne Heights
Waynesboro
Climate data from the nearest NOAA station, S Mtn, Pa (2.2 mi from Mont Alto). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.